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as this is. And this is continued from one end to the other of the Glass, on which you see it exhibited, in several places, without breaking; which breaking yet does not at all prejudice the truth of this Experiment. And although I had not time to open every part, which you see to belike that substance, I deny; yet I can order it so, as to show you with ease, that that also i nothing but Congeries of Vessels, as aforesaid, not yet opened; fix on what part you please.
And if it should be objected, that this may be drawn out into seeming Vessels, which yet may not be really such; I answer, that these Vessels have the same appearance in the Body of the Testis, as to denote them such, before they are drawn out; and in the extension it does sometimes so happen, that one of them will extend easily near halfe a yard long, before it breaks, though so exceeding delicate and tender, as you may imagine: And when it is thus extended, it hath a kind of resemblance of the corrugations of the Epididymis, and keeps the same figure and magnitude in the whole extent of them, as to the sight, unless they begin to dry, and then you may see them loose their giratians upon stretching: as you may see of both sorts on the Glass above mentioned.
And if the greatest part of these Vessels are Arteries, or other Vessels, that immediately receive liquors from them; I may prove, I think, from another Experiment, made by Injection into a part of the Arteria præparans, before I began to expand the Body of the Testis; whereupon opening the part, which I saw discoloured, I found, that many of these Tubes had received some of the fine particles of that matter, which I tinged my injected Spirit with.
And to prevent another Objection, that might arise, viz. That these particles might possibly change their colour only outwardly; I used other endeavours to assure my self, that the said particles were indeed included within the Cavities of these tubes. In the doing of which, I did moisten those two Tubes with Spirit of wine, to see whether that would remove of alter thoseparticles; but finding no such thing, I prickt an open'd with a fine needle part of the containing tube; whereupon I saw issue forth several of those liquid particles afore-men-tioned
